The graph shows the water level in a bathtub, in inches, over time, t, in minutes.

For which values of t (time) is the water level unchanging?

Choose all answers that are correct.



A.
from t = 0 to t = 3

B.
from t = 3 to t = 5

C.
from t = 5 to t = 7

D.
from t = 7 to t = 12

E.
from t = 12 to t = 15